i have noticed that some songs skip when playing on my ipod. it does not skip the entire song, but it sounds like an imperfection on a scratched cd. the song on the cd plays fine and when i import it into itunes, it plays fine there also. it just skips on my ipod. i have tried clearing the song and reimporting it, but it happens again at the same spot in the song. any ideas on why this happens and if it can be prevented? thanks.